A proper understanding of the mechanics of fluids is extremely important in many areas of engineering. In biomechanics, the flow of blood and cerebral fluid are of particular interest; in meteorology and ocean engineering, an understanding of the motions of air movements and ocean currents requires a knowledge of the mechanics of fluids; chemical engineers design the many different kinds of chemical-processing equipment; aeronautical engineers maximize lift and minimize drag on aircraft and design fan-jet engines; mechanical engineers design pumps, turbines, internal combustion engines, air compressors, air-conditioning equipment, pollution-control equipment, and power plants and civil engineers design piping systems, sewage treatment plants, irrigation channels, flood control systems, dams, and domed athletic stadiums.